No Empty Threats

An empty threat is a threat that we never follow through with.

The more we give empty threats the less seriously we are taken by our children and the more power they take from us. 

Give threats, you as a parent, are willing to do. If you aren't willing to cancel your Disneyland trip, don't threaten with that. 

If by mistake it slips out of your mouth, give them an option to earn it back with good behavior.